However the empirical evidence tells a very different story. Corporate managers have a demonstrated tendency towards wasteful ego-stroking empire building when not properly monitored. This is a classic principal-agent problem, where incentives drift away from shareholder interests.
Regular quarterly targets are an important part of management discipline. The longer CEOs have before being expected to deliver results, the longer they have to empire-build without being held accountable. Similarly investors bias towards bottom-line profits and cash flow. Those metrics are much harder to fake or spin, compared to intangible stories about brand value, market dominance or skunkworks projects.
When management does demonstrate credibility, Wall Street's usually more than happy to let them focus on long-term initiatives. Just look at Amazon, which is a darling of the investment community, trusted to steer nearly a trillion dollars in shareholder capital. Bezos has continuously poured huge resources into long-term speculative initiatives at the expense of quarterly earnings. And he's loved by shareholders for it, because he has a history of competence and putting company interests above personal ones.
[1] https://pdfs.semanticscholar.org/c1cb/684257b67940b9cf0d5aaa...